Danfoss Termix Compact 28 MST VMTD Operating Manual

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Operating Guide

Termix Compact 28 MST VMTD

1.0 Table of Contents

1.0 Table of Contents ............................................. 1

2.0 Functional description...................................... 2

3.0 Safety notes..................................................... 3

3.1

Safety Notes – general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

4.0 Mounting ........................................................ 4

4.1

Mounting the Compactstation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.2

Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.3

Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.4

Installation of other components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.0 Design............................................................. 13

5.1

Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2

Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.0 Controls .......................................................... 15

6.1

Heating circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.2

Other. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6.3

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.0 Troubleshooting .............................................. 20

7.1

Troubleshooting in general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.2

Troubleshooting DHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.3

Troubleshooting HE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.4

Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

8.0 Declaration...................................................... 27

8.1

Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

AQ461051191125en-000202 / LUK53534 | 1

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Summary of Contents for Danfoss Termix Compact 28 MST VMTD

Page 1 Operating Guide Termix Compact 28 MST VMTD 1.0 Table of Contents 1.0 Table of Contents ..........1 2.0 Functional description........2 3.0 Safety notes............. 3 Safety Notes – general ..........3 4.0 Mounting ............
Page 2 Space heating and domestic hot water (DHW) The Termix Compact 28 MST VMTD is a complete unit for space heating and domestic hot water for direct district heating in large buildings such as sports centres, schools, blocks of ﬂats etc.
Page 3 REACH All Danfoss A/S products fulﬁll the requirements in REACH. One of the obligations in REACH is to inform customers about presence of Candidate list substances if any, we hereby inform...
Page 4 Assembly, start-up and maintenance work must be performed by primary supply to Danfoss substations. For the sake of simplicity, qualiﬁed and authorized personnel only. DH can be taken to mean the primary supply.
Page 5 Operating Guide Termix Compact 28 MST VMTD Remove the front. Remove other blocks. Attach the mounting rail to the wall. AQ461051191125en-000202 / LUK53534 © Danfoss | 2024.08 | 5...
Page 6 Operating Guide Termix Compact 28 MST VMTD Lift the station. Mount the station on the mounting rail. Attach the station to the wall in the holes on the mounting plate. AQ461051191125en-000202 / LUK53534 6 | © Danfoss | 2024.08...
Page 7 Operating Guide Termix Compact 28 MST VMTD Install the isolation valves. Mount block A on the left-hand side of the pump. Attach block E to block A, and attach it to the pipe above the pump by clicking it in place.
Page 8 Operating Guide Termix Compact 28 MST VMTD Mount block F. The block is hinged and can be drawn around the valve. Attach the block to block B and E. Mount block J and H around the valve for the tank control.
Page 9 Operating Guide Termix Compact 28 MST VMTD 4.1.1 Installing the Compactstation Mounting: Adequate space Please allow adequate space around the substation for mounting and maintenance purposes. Orientation The station must be mounted so that components, keyholes and labels are placed correctly. If you wish to mount the station differently please contact your supplier.
Page 10 Operating Guide Termix Compact 28 MST VMTD 4.2 Start-up Start-up, Direct heating The shut-off valves should be opened and the unit observed as it enters service. Visual checking should conﬁrm temperatures, Re-thighten connections pressures, acceptable thermal expansion and absence of leakage.
Page 11 Operating Guide Termix Compact 28 MST VMTD 4.3 Electrical connections Before making electrical connections, please note the following: Safety notes Authorized electrician Please read the relevant parts of the safety notes. Electrical connections must be made by an authorized electrician only.
Page 12 Operating Guide Termix Compact 28 MST VMTD 4.4 Installation of other components 4.4.1 Prepararing for hot water recirculation Mark the position of the connection point and use a 35 mm drill cup. (Be mindful of the components on the other side of the insulation) Locate the bag with accessories.
Page 13 Operating Guide Termix Compact 28 MST VMTD 5.0 Design 5.1 Design Your substation might look different than the substation shown. Design description Heat exchanger DHW 10 Circulator pump Differential pressure controller 19 Surface sensor Electronic controller Air vent, manual 27 Actuator...
Page 14 Operating Guide Termix Compact 28 MST VMTD 5.2 Schematic diagram 5.2.1 Schematic diagram Termix Compact 28 MS VMTD Supply Supply Return Return Your substation might look different than the schematic diagram shown. Schematic description Heat exchanger DHW 16 Outdoor sensor...
Page 15 Operating Guide Termix Compact 28 MST VMTD 6.0 Controls 6.1 Heating circuit 6.1.1 Differential pressure controller The differential pressure controller smooths out the ﬂuctuations in pressure arriving from the district heating network. The operating pressure in the substation is thus held steady.
Page 16 Operating Guide Termix Compact 28 MST VMTD 6.1.3 Electronic control Substations with electronic control must be set in accordance with manufacturer´s instructions. Where the room temperature is controlled by radiator thermostats, it is recommended that thermostats be set for minimum temperature in each room.
Page 17 Operating Guide Termix Compact 28 MST VMTD 6.1.5 Circulator pump UPML UPML Pumps can be controlled in constant pressure or proportional pressure mode deﬁned by the means of a smart user interface. The variable speed modulating modes allow the pump to match its performance to the system requirements, helping to reduce noise when thermostatic valves are closing down.
Page 18 Operating Guide Termix Compact 28 MST VMTD 6.2 Other 6.2.1 Safety valve The purpose of the safety valve is to protect the substation from excessive pressure. The blow-off pipe from the safety valve must not be closed. The blow-off pipe outlet should be placed so that it discharges freely and it is possible to observe any dripping from the safety valve.
Page 19 Venting Checking that the system is thoroughly vented. Inspections should be carried out minimum every two years. Spare parts can be ordered from Danfoss. Please ensure that any enquiry includes the substation serial number. AQ461051191125en-000202 / LUK53534 © Danfoss | 2024.08 | 19...
Page 20 Operating Guide Termix Compact 28 MST VMTD 7.0 Troubleshooting 7.1 Troubleshooting in general In the event of operating disturbances, the following basic features should be checked before carrying out actual troubleshooting: • the substation is connected to electricity, Authorized personnel only •...
Page 21 Operating Guide Termix Compact 28 MST VMTD 7.2 Troubleshooting DHW Problem Possible cause Solution Too little or no DHW. Strainer in supply or return line clogged. Clean strainer(s). DHW circulation pump out of order or with Check circulation pump. too low setting.
Page 22 Operating Guide Termix Compact 28 MST VMTD 7.3 Troubleshooting HE Problem Possible cause Solution Too little or no heat. Strainer clogged in DH or HE circuit Clean gate/strainer(s). (radiator circuit). The ﬁlter in the energy meter on DH circuit Clean the ﬁlter (after consulting the DH clogged.
Page 23 Operating Guide Termix Compact 28 MST VMTD Too high DH return temperature. Too small heating surface/too small Increase total heating surface. radiators compared to the total heating requirement of the building. Poor utilization of existing heating surface. Make sure the heat is distributed evenly Defective sensor on self-acting thermostat.
Page 24 Operating Guide Termix Compact 28 MST VMTD 7.4 Disposal Disposal note This symbol on the product indicates that it may not be disposed of as household waste.. It must be handed over to the applicable take-back scheme for the recycling of electrical and electronic equipment.
Page 27 Operating Guide Termix Compact 28 MST VMTD 8.0 Declaration 8.1 Declaration of conformity AQ461051191125en-000202 / LUK53534 © Danfoss | 2024.08 | 27...

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